Thunder Shift Arms
Superior Performance Through Superior Clutching

TRA III (Aluminum) / TRA V (Steel-Black)                                                  TRA II  (Aluminum)                                                   

TRA Thunder Shift Arms can be used alone or in conjunction with:

Thunder Shift TRA Pin Kit

TRA Rollers (standard, 1mm & 2mm oversize)

The all new Thunder Shift Arms (TSA) for the Ski-Doo clutch are machined from aircraft grade billet aluminum.  The Thunder Shift Arms are five times stronger than stock arms - a must for big engines!
Thunder Shift Arms are available in the wide beam (3 grams lighter than stock arms) and a narrow beam arm which is 10 grams lighter and four times stronger than a stock arm.  Thunder Shift Arms come with all the weights necessary for adjustment and are bushed and gram weight matched.

Designed to get the power to the track, the new Thunder Shift Arms make the TRA clutch more adjustable than ever.  It's like having hundreds of different ramp profiles available.  Now you can make those fine adjustments to eliminate the peaks and valleys in your shift curve.

The best news of all is they are a bolt on component - no drilling, tapping or grinding and yes; you still have the full use of your clicker adjustments.  Thunder Shift Arms are patented and race legal.

Dyno run on 2001 MXZ800

The blue line is the stock MXZ800 shift pattern
The red line is the improved shift pattern by adding only the 
  Thunder Shift Arms.   This graph represents horsepower to the
  track.  Actual increase is 10 to 13 hp from 52 to 105 mph and 1
  to 2 hp below 52 mph.

TESTIMONIALS

Dave Trygstad:  " One of the most valuable clutching components you can get!" 
Trygstad Motorsports - Rochester, MN

Glen Kafka:  "It's a must for fine tuning with a multitude of adjustments."
Advanced Clutching - Stratford, WI

Guy Parquette:  "The Thunder Shift Arms sure made it a lot easier to go fast!"
Parquette Racing - Mosinee, WI

Jamie Bellman:  "The most user friendly clutching components I have ever seen."
Bellman Racing - Bremen, IN

John Wheelock:  "The Thunder Shift Arms make the TRA clutch a lot more tunable and consistant."
Pro Line Chassis - Pine Island, MN